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I have a few P5Q deluxe boards. SpeedStep is exactly where the bios says it is.
Did you flash your BIOS or are you using some nonstandard one?
Disabling C1E probably disabled speedstep. Either way I remember them being on the same bios screen.
Turn C1E back on and see if the option appears. I could look at my BIOS tonight. I have a few of these here at work but I can not take a file server down to look..